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A bicyclic graph is a connected graph in which the number of edges equals the number of vertices plus one. Let Δ(G) and ρ(G) denote the maximum degree and the spectral radius of a graph G, respectively. Let B(n) be the set of bicyclic graphs on n vertices, and B(n,Δ)={G∈B(n)∣Δ(G)=Δ}. When Δ≥(n+3)/2 we characterize the graph which alone maximizes the spectral radius among all the graphs in B(n,Δ)....
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